2-chloro-5,6-dimethylbenzo[d][1,3,2]dioxaphosphole 2-sulfide 、
10-羟基喜树碱 在
sodium hydroxide 作用下,
以
乙腈 为溶剂,
以55.3%的产率得到(S)-9-((5,6-dimethyl-2-sulfidobenzo[d][1,3,2]dioxaphosphol-2-yl)oxy)-4-ethyl-4-hydroxy-1,12-dihydro-14H-pyrano[3',4':6,7]indolizino[1,2-b]quinoline-3,14(4H)-dione